One of the most popular TV shows of all time is celebrating its 28th birthday.

“Seinfeld” took a while to find its feet after premiering in 1989, but by the mid-’90s the show was a hit.

It ended in 1997 after nine glorious seasons with more than 75 million Americans tuning in to watch the finale.

FAVORITE TV REUNIONS

To celebrate the show’s birthday, news.com.au assembled some of the most interesting facts about the “show about nothing.”

THE ROLE OF GEORGE

Jason Alexander wasn’t the first choice to play George Costanza.

David Letterman’s former musical sidekick, Paul Shaffer, revealed in his autobiography that Jerry Seinfeld originally offered him the role before the show debuted in 1989.

“There’s no audition,” Seinfeld reportedly said in a message he left for Shaffer.

“You’ve got the part. Just call us back!”

Shaffer never called him back.

JASON ALEXANDER THREATENED TO QUIT

The actor revealed to Access Hollywood that he once told co-creator Larry David that he might walk away from the show.

“Very early on Larry wrote an episode where Elaine and Jerry go to Florida and Kramer and George are not in that episode,” Alexander said.

“And when ‘Seinfeld’ started I had a very successful career in the theatre in New York which is what I thought I was going to be doing all my life. So when I was written out of an episode I came back the next week and I said to Larry, ‘Look, I get it. But if you do that again, do it permanently. If you don’t need me to be here every week … I’d just as soon go back home and do what I was doing’.”

THEME SONG

“Seinfeld” composer Jonathan Wolff rewrote the theme song for every single episode.

“I knew each monologue was going to be different because [Jerry] tells different jokes, so it had to be adjustable,” he told Great Big Story.

“I noticed that Jerry has a lyrical delivery to his jokes, and I put a clock on it … and that became the tempo for the theme. The bassline is so simple it can start and stop for his jokes, hold for laughs, and that way I could architect each piece of music for each monologue, Lego-style.”

JERRY SEINFELD’S FAVOURITE EPISODE

There were 180 episodes in total, but Jerry Seinfeld has two favorites in particular.

“One was the ‘The Rye,’ because we got to shoot that at Paramount Studios in LA which was the first time that we thought, ‘wow this is almost like a real TV show’,” Seinfeld said during a Reddit AMA.

“We hadn’t felt like a real TV show, the early years of the TV show were not successful … We felt like we were a weird little orphan show. So that was a big deal for us.”

And the comedian’s other favorite episode is “The Pothole.”

“Newman drives his mail truck over a sewing machine and his mail truck burst into flames,” Seinfeld recalled.

“It was really fun to shoot, and it was fun to set Newman on fire. And he screamed, ‘oh the humanity’ like from the Hindenberg disaster.”

SEINFELD STORYLINES

Carol Leifer was a writer on “Seinfeld” and told news.com.au that friends would always pitch ideas to her for potential storylines.

“When you write on ‘Seinfeld,’ the bane of any writer’s existence was people coming up to you and saying, ‘Oh I’ve got the best idea for a ‘Seinfeld’ episode’,” Leifer said.

But every now and then they gave her some gold.

“I have a friend from high school who said she had a great ‘Seinfeld’ idea. She said, ‘We had a dinner party the other night and these people brought a bread to serve at the dinner and I forgot to put the bread out and I noticed at the end of the night they took the bread home’.

“I remember saying to my friend, ‘You know what? I’m going to pitch to Larry and Jerry because I think there’s something there’. And sure enough when I pitched it to them, Larry David was like, ‘That’s a show. We’re definitely doing something with that’, and that became the episode called ‘The Rye.’”

SCRAPPED EPISODE

As Seinfeld revealed during a Reddit AMA, they decided to scrap an episode in which Jerry was going to buy a handgun.

“We started making it and stopped in the middle and said ‘this doesn’t work’,” he said.

“We did the read-through and then cancelled it. A lot of other stuff happened, but trying to make that funny ended up being no fun.”

A SHOW ABOUT NOTHING

As Jennifer Keishin Armstrong revealed in her book “Seinfeldia”, the people who made the show hated the whole “show about nothing” thing.

Seinfeld writer Peter Mehlman told Armstrong, “It created a kind of misnomer about the show”.

“I mean, it was the only show on TV that wasn’t about nothing! Seinfeld was taking on issue after issue after issue, and not even consciously. Just because, you know, Elaine dating a guy who’s anti-abortion — it’s funny!”

JERRY’S FAVORITE SEINFELD QUOTE

The only line that Jerry Seinfeld likes to quote from the show is: “If you’re one of us, you’ll take a bite”.

“It’s a very obscure line,” Seinfeld said on Reddit, “but George was working at some company where they all had lunch together, and he wasn’t trying the apple pie, and the boss finally says, ‘If you’re one of us, you’ll take a bite.’

“A lot of times kids won’t want to try certain foods, and so I’ll use that line.”

KRAMER’S HECTIC ENTRY

Kramer, who was played by Michael Richards, would charge through Jerry’s apartment door with such force that the crew had extra hinges on standby in case he broke the door.

KILLING OFF SUSAN

Jason Alexander told Howard Stern that the show’s creators decided to kill off the character of Susan because the cast had a hard time working with actor Heidi Swedberg.

“We went in there with a staggering sum and there was tremendous confidence that no one could walk away from it. He came to me and said, ‘I don’t have a life, I’m not married, I don’t have kids.’ We gave it everything we had, he was tempted, but in the end it was a quality of life decision.”

PARTING GIFT

Patrick Warburton, who played Puddy, told news.com.au that Jerry Seinfeld gave all of the cast members a gift after taping the final episode.

“We all got a lovely Cartier watch that said Seinfeld underneath,” the actor revealed.